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SubjectRe: [PATCH] async: Don't call async_synchronize_full_special() while holding sb_lock
Dave Chinner wrote:

> So, given the potential impact of this change, what testing have
> you done in terms of:
> - performance impact

I tested this on my machines and it gave a real performance improvement (11 to 8 seconds for a full kernel tree unlink, and cutting out
latency for normal applications)
> - sync() safety
that was exactly the synchronization point that's discussed here.

> - removing a million files and queuing all of the
> deletes in the async queues....

the async code throttles at 32k outstanding.
Yes 32K is arbitrary, but if you delete a million files fast, all but the first few thousand are

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